Towering Inferno: After terror attacks, London engulfed in terror of fire

Forty fire engines and 200 firefighters had been called to the scene early Wednesday morning.

The statement said the fire reached from the second storey of the building to the top and the cause of the fire was not known.

No confirmation has yet been made on any deaths in the fire.

Others told of seeing people shouting and waving from the windows for help, and seeing people shining torches from within as the blaze erupted in the dead of night.

A survivor of the massive high-rise apartment fire in London says he's lucky to be alive. More than 200 firefighters are now trying to snuff out the blaze engulfing the 27-storey Grenfell Tower on Latimer Road in North Kensington.

Assistant Commissioner Dan Daly says on the London Fire Brigade's Facebook page that it's a large and very serious fire.

He added: "They are being told to put a cloth over their mouths and try to get out by themselves".

A confronting image reveals much of the London apartment building engulfed in flame.

The fire broke out before daybreak local time Wednesday, when most of the building's residents would have still been in bed.

"We saw the people screaming", she said.

The 27-story Grenfell Tower was built in the 1970s and recently subject to a $10.9 million redevelopment, according to property firm Rydon.

In a statement posted to Twitter, London police say two people are now being treated for smoke inhalation and they're waiting updates on further injuries.

The blaze is thought to have broken out on the fourth floor, but that's yet to be officially confirmed.

An emergency number has been set up for anyone concerned about loved ones after the fire in west London.